Update insource build error message
Update the error message shown in case an in-source build is attempted.
Remove reference to mercurial scm.
The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.
Check before merging:
- All discussions are resolved
- At least 2
👍votes from core developers, no 👎vote.
- The feature branch is (reasonably) up-to-date with the base branch
- Dashboard is green
- Copyright owner has signed the ORFEO ToolBox Contributor License Agreement